My object isn't rotating to the transform of another object. How do I fix this?

I am making a game where I need an object to repeatedly rotate to the exact transfrorm of blasterTrans. however when played, when you press z it will go to the rotation of blasterTrans, but then when you press z again, it will go completely off course and not in the rotation of blasterTrans. Note: blasterTrans is a rotating object.

here's the code

<

 public class Shooting : MonoBehaviour {
 public Transform blasterTrans;
 public Rigidbody rb;
 public bool bulletMoving;
 public float bulletSpeed;

void Start () {

}

void Update () {

    if (Input.GetKeyDown("z"))
     {
         Fire();
     }
     if(bulletMoving == true)
     {
         transform.Translate(0, 0, bulletSpeed * Time.deltaTime);
     }

}

 public void Fire()
 {
     transform.Rotate(0, 0, 0);
     transform.position = (new Vector3(blasterTrans.position.x, blasterTrans.position.y, blasterTrans.position.z));
     transform.Rotate(new Vector3(blasterTrans.eulerAngles.x, blasterTrans.eulerAngles.y, blasterTrans.eulerAngles.z));
     bulletMoving = true;
 }

}